Mary McDonnell by Jim Spellman/ WireImage.com; Melissa George by Steve Granitz/ WireImage.com
Grey's Anatomy is looking to clean up this sweeps with the addition of two very familiar faces.

In the same November episode (exact airdate TBD, thank you, McCain and Obama), Mary McDonnell (aka Battlestar Galactica's Roslin) and Melissa George (Vaughn's eeeeeevil wife on Alias) will begin recurring roles on the ABC serial.

McDonnell will play a surgeon scrubbing in at Seattle Grace, while George will appear as an intern who very well may further complicate Callie and Erica's already-sticky Sapphic situation.

Both actresses are signed for multiple episodes, with George having the possibility of becoming a series regular, say sources. Word of George's possible Grey's visit was originally reported by EW's Ausiello. - Matt Mitovich